Regenerative brake controller for controlling value of regenerative braking torque simulating engine braking torque

• US 5,915,801 A
• Filed: 06/11/1996
• Issued: 06/29/1999
• Est. Priority Date: 07/18/1995
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ibaraki, Ryuji, Taga, Yutaka
• Primary Examiner(s): Poon, Peter M.
• Application Number:
  US08/660,595
• Time in Patent Office: 1,113 Days
• Field of Search: 303/151, 303/152, 303/3, 303/15, 303/20, 318/376, 318/363, 318/371, 318/372, 318/375
• US Class Current: 303/152
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/642 Slope of road
• CPC Class Codes: B60L 2260/30 Engine braking emulation
• CPC Class Codes: B60L 50/15 with additional electric power supply with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: F16H 59/10 comprising levers
• CPC Class Codes: F16H 61/21 Providing engine brake control
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y10S 903/919 : Stepped shift
• CPC Class Codes: Y10S 903/945 : Characterized by control of gearing, e.g. control of transmission ratio

Abstract

A regenerative brake controller for controlling a value of regenerative braking torque to simulate engine braking torque. When the shift lever is in the D range, from a first control map which correlates the vehicle speed and the like with target braking torque or target deceleration, the controller reads the target braking torque or target deceleration corresponding to the vehicle speed immediately before the release of the accelerator pedal, and controls the vehicle components on the basis of the read target braking torque or target deceleration such that the regenerative braking torque corresponding to the engine braking torque is produced. When the shift lever is in the engine braking range, the controller detects the shift lever position in this range, determines the target braking torque or target deceleration by referring to the map, and on the basis of the vehicle speed and the like immediately before the release of the accelerator pedal and the shift lever position in the engine braking range, and controls the vehicle components according to the determined target braking torque or target deceleration such that the regenerative braking torque corresponding to the engine braking torque is produced. In connection with the regenerative braking torque corresponding to the engine braking torque, the vehicle drivability can be improved.

Claims

1. A regenerative brake controller comprising:

means for determining target braking torque based on a basic quantity which is at least one of, an accelerator pedal releasing speed, a road gradient, a vehicle weight, and a relative positional relation with a forward obstruction; and

means for controlling regenerative braking torque to simulate internal combustion engine braking torque based on the target braking torque.

2. The regenerative brake controller according to claim 1 further comprising:

a manual shift member for producing an engine braking shift position signal whose value is changed according to the operation by a user when the manual shift member is shifted in the engine braking range according to the operation by the user; and

means for changing said target braking torque according to the value of said engine braking shift position signal when said manual shift member is in said engine braking range.

3. The regenerative brake controller according to claim 1 further comprising:

map means for correlating said basic quantity with the target braking torque;

wherein when the accelerator pedal is released, said target braking torque is determined with reference to said map means.

4. The regenerative brake controller according to claim 1, wherein the target braking torque is determined according to the accelerator pedal releasing speed when the accelerator pedal is released.

5. The regeneration brake controller of claim 1, including means for determining an accelerator pedal releasing speed.

6. The regeneration brake controller of claim 1, including means for determining a road gradient.

7. A regeneration brake controller comprising:

means for determining target deceleration based on a basic quantity which is at least one of an accelerator pedal releasing speed, and a relative positional relationship with a forward obstruction; and

means for controlling regenerative braking to simulate internal combustion engine braking torque to realize said target deceleration.

8. The regenerative brake controller according to claim 7 further comprising:

a manual shift member for producing an engine braking shift position signal whose value is changed according to the operation by a user when the manual shift member is shifted in the engine braking range according to the operation by the user; and

means for changing said target deceleration according to the value of said engine braking shift position signal when said manual shift member is in said engine braking range.

9. The regenerative brake controller according to claim 7 further comprising:

map means for correlating said basic quantity with the target deceleration;

wherein when the accelerator pedal is released, said target deceleration is determined with reference to said map means.

10. The regeneration brake controller of claim 7, including means for determining an accelerator pedal releasing speed.

11. The regeneration brake controller of claim 7, including means for determining a relative positional relationship with a forward obstruction.